5439_2007_Pothole #3 Test for Wheels and Tires.docx
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5439_2007_Pothole #3 Test for Wheels and Tires.docx
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Pothole#3TestforWheelsandTires
1 Scope
Note:
Nothinginthisstandardsupersedesapplicablelawsandregulations.
Note:
IntheeventofconflictbetweentheEnglishanddomesticlanguage,theEnglishlanguageshalltakeprecedence.
1.1 Purpose.ThepurposeofthistestistoassesstheperformanceoftiresandwheelsinassociationwiththevehiclesuspensionandbodystructureusingPothole#3usedfordurabilitytesting.
1.2 Foreword.Typically,twotireandwheelassembliesareassessedinthistest,oneonthefrontcornerandtheotherontherear,andbothonthesamesideofthevehicle.
1.3 Applicability.Thistestappliestocars,wagons,SUVs,passengervans,pickuptrucks,andcargovans.Itcanbeusedasacomponenttestoravehiclesystemtest.
2 References
Note:
Onlythelatestapprovedstandardsareapplicableunlessotherwisespecified.
2.1 ExternalStandards/Specifications.
None
2.2 GMStandards/Specifications.
GMN9725 GMW15445
GMW3238 W01WU1
2.3 AdditionalReferences.
GMDrawing9590710WheelSpec.-WheelUniformityRequirements
3 Resources
3.1 Facilities.PotholetestfacilityasdescribedinGMW3238,GlobalPotholeTestFacilities.
3.2 Equipment.
3.2.1 WheeluniformitymachinerycapableofmeasuringwheeluniformitycoefficientsasdescribedinAppendixA,sectionA1.
3.2.2 PositionmeasurementmachinerycapableofdeterminingwheelbeadseatsradialandlateralcoordinatesasdescribedinAppendixA,sectionA2.
3.2.3 (Optional)Measurementdevicescapableofdeterminingwheelrimedge/rimflangeradialandlateralcoordinatesasdescribedinAppendixA,sectionA3.
3.2.4 Tirepressuregauge.
3.2.5 Ballastwhichconformstoappropriateprovinggroundballastingprocedures.
3.2.6 Radarunitorotherdevicecapableofbeingcalibratedtocorrectlyindicatevehiclespeed.
3.3 TestVehicle/TestPiece.
3.3.1 Testwheelsshouldbeminimumstockconditionunlessotherwisespecifiedbytherequestor.
3.3.2 Testtiresshouldbesufficientfortestwheels.
3.4 TestTime.
3.5 TestRequiredInformation.
3.5.1 Tiresize(s).
3.5.2 Tirepressure(s).
3.5.3 Testassemblylocationsonthetestvehicle.
3.5.4 Frontandrearaxleweightsspecifiedfortestor,ifnotspecified.
3.5.4.1 FrontandrearGrossAxleWeightRating(GAWR)forthevehicleforwhichthetestassembliesareintended.
3.5.4.2 GrossVehicleWeight(GVW)forthetestvehicletobeused.
3.5.4.3 FrontandrearGAWRforthetestvehicletobeused.
3.6 Personnel/Skills.Personnelshouldhavethefollowingtrainingorcredentials:
3.6.1 Vehiclelift/hoistoperation.
3.6.2 MustmeetappropriateProvingGroundsDrivingRegulationstooperateavehicletoandfromandinthepotholetestfacility.
©Copyright2007GeneralMotorsCorporationAllRightsReserved
September2007
OriginatingDepartment:
NorthAmericanEngineeringStandards
Page1of6
4 Procedure
4.1 Preparation.
4.1.1 Performpre-testassessmentoftestwheels.Testrequestorshouldbeinformedoftheresultsinordertodeterminewhetherornotawheelshouldbeacceptedorrejectedforuse.
4.1.1.1 Inspectwheelsforcracksusingdyepenetrantorequivalent.Ifawheelhasacrack,itshouldnotbeusedasatestspecimen.
4.1.1.2 Measureandrecordpre-testuniformitycoefficientsasdescribedinAppendixA,sectionA1.ProcedureW01WU1isanexampleofawheeluniformitymeasurementmachineoperator'sprocedure.
4.1.1.3 Measureandrecordpre-testbeadseatsradialandlateralcoordinatesasdescribedinAppendixA,sectionA2.
4.1.1.4 Ifrequested,measureandrecordpre-testrimedge/rimflangeradialandlateralcoordinatesasdescribedinAppendixA,sectionA3.
4.1.2 Performpre-testassessmentoftesttires.
4.1.2.1 Inspectforvisibledamage.Ifatirehasvisibledamage,itshouldnotbeusedasatestspecimen.
4.1.2.2 Thetestrequestorshouldarrangeforshearographytobeperformedontesttiresifthefocusofthetestisontireperformance.
4.1.3 Mounteachtesttireonitsrespectivetestwheel.
4.1.4 Installeachtestassemblyonthetestvehicleinthepositionrequestedandinflateeverytireonthevehicletothepressurerequested.Ifpositionisnotspecified,typicalplacementisleftfrontandleftrear.Recordthepositionsofthespecifictestassemblies.Notethatforsomevehiclesthefrontandreardesignintentassembliesmaydifferintheirdimensionsandpressures,andthisintentshouldbereflectedinsetup.Ifthepressuresarenotspecified,usepressurespecificationsforthevehicleforwhichthetestassembliesareintended.
4.1.5 Ballastvehicleperappropriateprovinggroundballastingproceduresanddrivingregulations.
4.1.5.1 References.AnexampleofaballastingprocedureisGMW15445VehicleBallast.
4.1.5.2 Passengers.Passengersorwatercontainersusedtosimulatepassengersaretobeinalldesignintentpassengerseatinglocations.
4.1.5.3
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